SOLUTION: soil from beneath the church was found to have lost 12% of its carbon-14. How old was the soil?

Question 250313: soil from beneath the church was found to have lost 12% of its carbon-14. How old was the soil?
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
THe general formula we need is:

I think 1/2 life of carbon is 5280 years. If not use the correct number and these steps.
Also we have lost 12% which means 88% is till there. So we have

divide by 100 to get

log both sides to get

years
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